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    • 2019 NOAA NGS 4-band Ortho-rectified Mosaic of Chesapeake Bay (Gwynn to Newport News, VA)

    Metadata Updated: October 31, 2024

    This orthoimagery data set includes 0.3 meter 8-bit 4-band (RGB-IR) digital orthoimage tiles in GeoTIFF format. Geographic Extent: 7 counties in Maryland, covering approximately 569 total square miles. Dataset Description: The Chesapeake Bay NOAA Option 3 project called for the planning, acquisition, processing, and derivative products of imagery data to be collected at a ground sample distance (GSD) of 0.3 meter. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD1983 2011 UTM Zone 18N, Meter. Orthoimagery data were delivered in 164 individual 3000 m x 3000 m tiles as 0.3 meter 8-bit 4-band (RGB-IR) orthophoto tiles in GeoTIFF format.

    Ground Conditions: Imagery was collected in fall 2018 and spring 2019, while no snow was on the ground and rivers were at or below normal levels. In order to post process the imagery data to meet task order specifications and meet ASPRS horizontal accuracy guidelines, Quantum Spatial, Inc. utilized a total of 3 ground control points to assess the horizontal accuracy of the data.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date February 29, 2024
    Metadata Created Date October 31, 2024
    Metadata Updated Date October 31, 2024
    Reference Date(s) April 30, 2021 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NOS NGS

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 29, 2024
    Metadata Created Date October 31, 2024
    Metadata Updated Date October 31, 2024
    Reference Date(s) April 30, 2021 (publication)
    Responsible Party National Geodetic Survey (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:64516
    Access Constraints Cite As: National Geodetic Survey, [Date of Access]: 2019 NOAA NGS 4-band Ortho-rectified Mosaic of Chesapeake Bay (Gwynn to Newport News, VA) [Data Date Range], https://www.fisheries.noaa.gov/inport/item/64516., Access Constraints: None, Use Constraints: Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations., Distribution Liability: Users must assume responsibility to determine the usability of these data. These photographs were obtained for use by NGS during the course of its development of potential final products to fulfill its statutory mission. Although NGS is making these photographs available to others who may find the photographs of value, NGS does not warrant, endorse, or recommend the use of these photographs for any given purpose. NGS is providing these photographs "as is," and NGS disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NGS be liable to you or any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data. Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners
    Bbox East Long -76.20805555556
    Bbox North Lat 37.51472222222
    Bbox South Lat 37.05166666667
    Bbox West Long -76.66805555556
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 5b453df8-6e7b-485a-bfb6-873d80ac990d
    Harvest Source Id ea6e63e6-96bb-4fb1-a72f-b7af08062c83
    Harvest Source Title NOS NGS
    Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
    Lineage Aerial imagery was acquired using a UltraCam Eagle camera with a flight design that included a total of 10 flight lines. Aerial imagery was supplemented with the simultaneous acquisition of airborne GPS/IMU data, which captured the ground coordinate for the nadir point of each photograph. Aerial imagery was exposed at an altitude of 13100 feet above mean terrain. Softcopy aerotriangulation was performed utilizing the airborne GPS/IMU data, GPS ground control and image coordinate measurements allowing the direct computation of the exterior orientation parameters for each image of the project. A compilation of topographic land form elevation datasets developed using in-house LiDAR data and data from the National Elevation Dataset for use in developing digital ortho imagery. Quantum Spatial performed a geodetic control survey in support of the digital orthophoto production project. A total of 3 points were used for QC testing.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-76.66805555556, 37.05166666667], [-76.20805555556, 37.05166666667], [-76.20805555556, 37.51472222222], [-76.66805555556, 37.51472222222], [-76.66805555556, 37.05166666667]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System EPSG::6347
    Spatial Harvester True

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